Heating-element support



2 Sheets-Sheet 1` March 6, 1928.

' W. CAMPBELL HEATING ELEMENT SUPPORT" Filed Aug.l3, 1923 (3 @MVA l March 6, 192s.

l 661464 w. CAMPBELL HEATING ELEMENT SUPPORT Filed Aug.1:s, 192s 2 sheets-snee*v 2 Y LIBERE!!! z m Y -J 1/ 111/1111,. 'ull/1111111111141 Patented Mar. 6, 1928.-

WILLIAM CAMPBELL, OF DETROT, MICHIGAN.

HEATING-ELEMENT SUPPORT.

Application led August 13, 1923. Serial No. 656,994.

This invention relates to a detachable holder' or mounting for electrical heating elements and more particularly to a holder and contact device tor the heating elements ot electrically heated tireless cookers. An object ot' the invention is to provide means ior securely positioning and holding an electrically heated element Within a closed receptacle so that it may be quickly and readily detached and removed tor the purpose of cleaning or repair.

A turther object is to provide eliciently insulated terminals tor an electrical heating'element which are constructed so as to insure a proper electrical connection and so arranged as to guard against accidental short circuiting or fouling oi the terminals.

A further object is to provide a holding device for electrically heated elements of tireless cookers and the like which are located Within the bottom of la closed ehanr ber and to so construct such holding device that it may be readily manipulated troni the exterior ot the chamber :tor the purpose ot' releasing the heating unit that it may be readily detached and removed. It is also an objectl to construct a holding device for the purpose, which holding device embodies electric. terminals or contacts for the heat ing element or unit and which devices and terminals are so arranged as to insure proper electrical connection and Which terininals are operable from the exterior of the receptacle to insure such electrical connection, all arranged in a` manner to provide proper insulation and prevent short circuit ing by water of condensation and injury to the operator through contact with electrically charged exposed parts.

The invention further consists in the several advantages of the construction and arrangement7 all as hereinafter more fully set forth.

lVth the above and other ends in view the invention consists in the mat-ters hereinafter set forth and more particularly pointed out in the appended claims, reference being had to the accompanying drawings, in which Figure l is a central vertical section sub stantially upon the line 1 1 of Fig. 2, through a tireless cooker showing a heating element or unit in elevation therein and held in place by means illustrative of the invention;

Fig. 2 is a horizontal section substantially apon the line 2-2 ot' Fig. l;

Fig. 3 is an enlarged sectional detail of the front end portion ol a holding device illustrative ot the invention showing the device in operative position Within the Wall ol the cooker and in operative relation to a portion ot a heating unit, and

Fig. a is a sectional view similar to Fig. 3 showing the rear end portieri of the holding device.

In the construction of electrical heating devices it is desirable that the heating elenient be detachably held in place and that such holding device embody contacts for making the electrical connection between the element and the loading-in wire, and this is particularly true in the construction or tireless cookers and the like Where the heating element or unit is placed in the bote toni ot a chamber' and is therefore not readily accessible 'lor its removal.

Vvlhilc the present invention may be applicable lo other uses than in connection with a tireless cooker, yet it is particularly applicable to such use7 and is shown as embodied in such construction.

ln the accompanying drawings, 1 indicates a suitable receptacle which may take the torni as shown, ot a tireless cooker provided with double Walls with the space between the walls iilled with a suitable insulating material. 2 indicates the chamber or .space within the bol; or receptacle and in the bottoni ot which an electrically heated healing unit 3 is positioned. This heater 3 may be constructed in any suitable manner but as shown, it comprises a cast body of suitable insulating material tormed with a spiral groove a in the upper :tace thereof within which groove a coiled Wire 5 of high resistance metal is laid, said coil forming the heatingv element which is heated by the passage or current therethrough. The ends of this coil are electrically connected to terminal posts (i embedded within the body and terminal plates T connected to these posts within grooves or recesses 8 in the lower side ct the body, the outer ends oit these plates being upturned and embedded Within the outer 'tace oi the body as shown at 9. A depression or notch l() is vformed in the upturned end portion 9 ot each terminal plate and into these notches the pointed ends of terminal rods 1l and l2 are engaged When the l'ieuter .is in place within the ohuinben '.iihe terni' i il rod ll is curried by u suitable insulating` ineinbrr preferably ornied of porcelain und comprising inner parts 13 und le which nre located between the nner'und out xr wells or' the double walled receptacle. rl'he insulator uis includes un inner end ineniber l5 which projects into the chamber 2 und luis en end projection i6 to engage u cor' ondinggly shaped recess in the adjecent end ot the ineniber lei, said projection lili litt-ing.;l .vilbin und eitending through an opening in the inner well 'liY of' 'the receptecle. ri lending-in wire 'lll is embedded within the insulating ngiuleriul 19 between the inner irzill li' und the outer Wall 20 und tbis wire elfitends through :i notch 2l in the inen'iber into u recess in suid nieniber where it is secured in any suituble n'ninner to trie outer end or the tcrniinul rod l1. 'the member oil? the ins ietor is torined with bis into the open end nn :nini boss 223 riich oi the clniniber l, this interniediute ineinlier il und fi ier ineinber beingformed 'with en nniul bore ro receive the terniinnl rod. lglie three members or parte comprising the iusulnliu- :ire 'therefore iiiterloclied und by such interlocliin :rre held in zilineinent end the end .ineinber is held in position by beine secured 'lo the intermediate nieinber ifi by the rod ,il with the 'liner vvell li' lirlnly clamped between Vhe pzirls lend l5 to hold the inse `itor irinlv in position upon the Well und within tiri/space lietvfeen the inner und outer wulls. fr tirin und rigid terminal is thus provided ufor the lending-in Wire which terininul is thoroughly insulated troin 'the inetul wells ol the recept: Y pind with only the )ointed end oli' the tern'nnul rod project/ing 'through the end 'te ce of the insulator. lbe body ot the heater 3 n ey 'therefore be rigidly held und :i goed electricul connection inside by the engufreniei Lbis pointed cnil oil the terminati rod with the notch in the 'terminal plete cin'riefl by the body of the herten @nly the pointed end oi the rod is ci-pesed and tits within n very :nmrovvr space between 'the end oit the insulator und the body of the beater so thut the liability ot short circuitingl the current is obviated end the fouling; ot the electricsl connection by dirt or particles getting in between 'the terniiiiul plete und the tern'iinul rod is prevented.

lron'i the terininzil rod ll the Wire lil leeds through the insuintion l@ or the container between its wells li und 2O to e suitable pluri or suche-t Qfl indicated in dotted lines in liic. l Yfor the connection thereto of wires .lendingiqron'] the usziiel house Wiring4 or other ,source oit elec Vic current7 and :troni this socket u second Wire lends to suitehle automatic cut-out switch mounted in e causing 26 on the trent 'well or the coi'rtuiner, said automatic switch being of any suitable torni and construction and if found desirable may elso'enibody a suitable electrical connection tor the current supply wires which connection would obvizite the necessity' tor the socket 2l. Freni the inviti-li e leudingn Wire 2i' extends to .an .insuiuting ineinber mounted in the front Well ot' the container und embodying tile ter niinnl rod 1 2. This insulator comprises an inner end inelnber 28, an intermediate ineinber 2i), n, cup 3() and :i handle 3l connected to the outer end ot the rod l2 by ineens ol*Y which this rod muy be turned. 'l`he ineinbers und are formed with un zixiul bore to receive :L sleeve having u head i3 :it its inner end und being` internally screwtlireiided throughout a portion of its length to receive the screwthrezided inner end portion oi" the rod The inner end or bend olf the insulator is tornled with a recess "o receive the huid 33 ot the rod und .is also )rovided with en end projection 34 to extend ynrough un opening` in the inner Wall 17 of 1e c sing und lit within n correspondingly in'ined socket vor recess in the inner end ot' "ie nieniber 29. 'the outer end oi the sleeve is serewthreuded to receive e nut 35 and the lending-in wire 2l' is electrically con iiected` to the sleeve by being clamped by the nut against u washer 3G interposed between the nut und :an end Well ot e recess 37 in the outer end olil the niernber 29. rlhe nut and vusher are therel'ore .enclosed within the reessed outer end ot' the nieinber 2S) and by turning up the nut on the sleeve the parts 28 und 29 ot tbeinsuietor are secured together with tbe boss or projection ifi ol the part Q8 engaged in the opening` of the Wall l? to hold the insulator iirinly in place and also projecting into the socket or recess in the end ol the member S29 to hold the two nienibers ot thev insulator in filineinent und rigidly secured in place. 'lhe cap 30 lits closely over 'the outer end ot the ineniber 29 und closes the outer end oitl the chamber or recess 38 therein und this cup has a tubular extension 38 which projects through nu opening in cover plate 39 which forms u closure for an opening` ll() in the outer will 2l) ot the receptecle. The lnindle 3l which is rigidly secured in any suitable manner 'to the outer end ot the rod l2, is formed of suitable insulating 1nuteriul and projects through un axial opening in the extension 38 of the cup. Upon V'the inner end olz the bundle 3l a things ll is formed to limit the outward movement oit the handle writ-hin the cap :ind prevent the coiiipiete Withdrawal ot the rod l2 find handle tlnough the opening in the `Front wall ot the casing. Ready acc-ess may, honY` over, be hud to the insulator sind connections by rinnfnu'nn` the cover plate 39, when' the cup inoy be removed through the openingl0 lou in the casing wall and the other parts adjusted or taken out through said opening,

f The inner end ot the terminal rod 12 is pointed to engage a notch or depression ina terminal plate on the heating unit 2, which plate is of the same 'form and construction as the terminal plate 9 and is mounted in a like manner upon the body of the heating unit.

When it is desired to remove the heating unit 3 'trom the chamber 2, it is only necessary to turn the handle 31 which projects through the front wall of the receptacle, thus retracting the terminal rod 12 from engagement with the heating unit, When said unit may be lifted out. In replacing the heating unit it is only necessary to set the unit upon the bottoni ot the chamber and then turn the handle 31 to screw the terminal rod 12 inwardly into engagement with the unit which will thus be torced into engagement with the terminal rod 1l at the opposite side, when the unit will be securely held by the engagement ot the pointed ends of the terminal rods with the terminal plates mounted on the unit. Proper electrical connection with the unit is insured by the engagement ot the pointed ends of the terminal rods with the terminal plates and good contact is insured as the rod 12 may be screwed inward until. such contact is obtained. The construction of thel insulator insures against short circuits and also provides for its ready installation or removal and for access to the terminal connection and the terminal rod.

As usually constructed and applied to tireless cookers, the heating unit is held in place within the chamber of the cooker by means located within the chamber and therefore in order to operate such connection and release the unit, it is necessary to operate the connection irom within the chamber and as the unit is located at the bottoin'of the chambei, it is etten unhandy and ditlicult to make the proper electrical connection. With the present construction the holding means which also forms the electrical connection with the heating element, extends through the wall ot the casing so that it may be operated from outside ol -the casing where it is handy to get at and Where its operation is made positive and certain.

lhanges in the size, proportion, and arrangement ot parts are contemplated and all changes or modifications which fall Within the scopey ol the appended claims may be made Without departing from the spiritl of the invention.

Having thus fully described my invention, what l claim is 1. The combination with a receptacle, an electrical heating unit in said receptacle, insulators mounted in opposite side Walls of the receptacle, electrical terminal members mounted within said insulators to engage and make electrical connection with the heating unit, one of said terminal members being adjustable into and out of engagement with the heating unit to detachably clamp said heating unit between said terminals and to make and break electrical connection therewith, said adjustable terminal being extended through the wall of the receptacle in which it is mounted and being adjustable trom outside of the receptacle.

2. The combination with a double walled receptacle and an electrical heating unit in said receptacle, ot insulators mounted upon the Walls ot the receptacle at opposite sides ol'A the heating unit, terminals carried by said insulators to engage the heating unit and make electrical connection therewith, leading-in wires between the inside and outside walls ol' the double walled receptacle and connected to said terminals, said insulators being 'formed with chambers to receive the ends ot the wires and within which chambers said wires are connected to said terminals, and means upon the outer end of one of said terminals and extending through the outer wall ot the casing for operating said teri'ninal trom the exterior of the casing to move it into and out of engagement with the heating unit. n

3. The combination with a receptacle and an electrical heating` unit in said receptacle comprising a. body ot insulating material and a heating element carried by said body and having terminals at opposite sides of the body; ot an insulator mounted upon a Wall of the receptacle and supporting a terminal to engage one of the terminals on the heating unit, an insulator mounted in the Wall of the receptacle, at the opposite side of the heating unit, a terminal rod carried by said last mentioned insulator and adjustable longitudinally therein into engagement with the terminal of the unit, and an insulating handle on the outer end of said terminal rod, said handle extending through the wall of the container and operable from the exterior thereof' to adjust the terminal rod into and out ot engagement with the heater unit to release the unit and permit its removal from the container.

4. The combination with a receptacle having` parallel walls and insulating material between said Walls and an electrical heating unit within the receptacle and comprising a body ot insulating material With the heating element carried by the body having terminals at opposite sides of the body; of insulators mounted upon opposite Walls of the receptacle and extending through the inner Wall of the double walls ot the receptacle, said insulators each comprising a plurality of parts having interlocking portions, terminal rods in said insulators and holding the parte of the insulators in inter-locked relation, the

aga.

inner ends of snidrods projecting through' the nneil en de of the insulators to engage and make electrical eonnection'with the heating unit, oneo'f said rods being adjustable longi tudinzilly into and out oi' engagement with the heating;` unit to demohebly Secure the nnit` in place Within the receptacle.

5f The oon'ibina'tion with e double Walled receptacle and en' eleetiieal heating unit in the receptacle; of zi, terminal eari'iedhy one Wall oit 'the receptacle at one Sid-e of the unit to engage the unit and foim electric-al connection therewith, zin insulator mounted in openinge` in the inner and outei` wzillsof the douhlewzilled receptacle it the side oi the heating unit opposite that. engaged by seid terminal, e sleeve mounted in an axial bore oi the ineulatoi' and provided with an intern nel screw thread, n terminal rod Somewmei-,4.64

threadedto engage theserew thread of the sleeve and extend theiethiough to engage the heating, unit at its inner end, and an .insulatingihnndleon theoutei end of the terminel. rod extending through th'e'opening in the Vouteil wall of the receptacle-andoperehle from the enterioil of Vthe receptacle to turn the rod and move th'esaine-into and outof engagement with the heating unit.

6. A- device-as characterizedineleim, 5, and including' n een on the outer end of `the ineuletoi' which Cini hee nn axial opening.v through which Seid handle extendmand. aiv

closure plate `detnic'lmlol-y secured to the outer well ot the receptacle over the opening therein..

lnteetiinony whereof Inlix my singinture.

VVLLAM CAMPBELL. 

